Okay, I'm seeing a few separate issues here.
1. Gentoo expects to compile everything from source.
This isn't an option here since LuaMetaTeX doesn't have any source
available (yet). So for the time being, you'll need to use the provided
binaries. These support pretty much every architecture, so this
shouldn't really be a problem.
2. You want to install ConTeXt LMTX system-wide.
This is doable with the standard Linux installer script. Just make sure
to run the script as root and install the files in /opt/context. This is
what I've done on my system, and it works quite well.
$ ls -l $(type -p context)
lrwxrwxrwx. 1 root root 10 Jul 28 00:33
/opt/context/tex/texmf-linux-64/bin/context -> luametatex*
3. You want to install ConTeXt without any network access.
The easiest way to do this would be to install on a system with
internet, then just copy over the files.
If you want to use the "original" installer files, it shouldn't be
impossible, but probably not too easy either. (All steps below are
untested)
The platform-independent stuff is all in one big zip, located at:
http://lmtx.pragma-ade.nl/install-lmtx/texmf-context.zip
Unzip this file as "<context root>/tex/texmf-context/".
Then you also need to download all of the binaries. You will need to
download all of the paths listed in this file:
http://lmtx.pragma-ade.nl/install-lmtx/tex/texmf-linux-64.tma
All of those files need to be placed in "<context root>/tex/texmf-linux-
64/bin".
Then to finish installing you'll need to run "mtxrun --generate" and
"context --make". There are probably a bunch of other steps that I'm
missing, but this should get you close.
Again, probably easier to just use the regular installer.
4. ConTeXt is really picky about texmfcnf stuff.
This is an issue that I've had too:
https://github.com/latex3/l3build/issues/232
Pretty much any modification of anything texmfcnf-related with ConTeXt
will completely prevent it from running. There's a thread discussing the
problem (but with no real solutions) here:
https://tug.org/pipermail/tex-live/2020-September/046099.html
And a Wiki page here:
https://wiki.contextgarden.net/Custom_Configuration
I agree that this texmfcnf stuff makes it really difficult to install or
use ConTeXt with any kind of custom paths. Does anyone know how to
properly configure a texmfcnf with custom paths?
Hopefully this is of some help.
-- Max
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